Update bar chart UIAxes from EditField value without deleting older plot

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FEH 2023-5-10

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https://ww2.mathworks.cn/matlabcentral/answers/1960589-update-bar-chart-uiaxes-from-editfield-value-without-deleting-older-plot

评论： Cris LaPierre 2023-5-15

Hi. I am building an app where whenever I enter value in EditField it automatically plot a bar chart in UIAxes.

I manage to do that. However, I would like to continously update the bar chart wehenever new value enter into the EditField without deleting the older plot (bar chart).

Appreciate your help on this matter.

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Simon Chan 2023-5-10

编辑：Simon Chan 2023-5-10

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The following may be a workaround for you, noticed that someone may have a better solution.

When you define the UIAxes, set its user data to an empty array

set(app.UIAxes,'UserData',[]);

When you enter a new EditField, the UserData will be updated.

In this case, it simply overwrite the previous plot with a new plot and hence no need to use hold on and hold off.

However, if you use the same axis for a completely new plot, you need to set the UserData of the UIAxes to [] somewhere otherwise the old data will not be clear.

Y = [app.TotalAllowableWeighttonEditField.Value;app.ActualTotalWeighttonEditField.Value];
app.UIAxes.UserData = [app.UIAxes.UserData;Y'];
bar(app.UIAxes,X, app.UIAxes.UserData,'grouped','FaceColor','flat');

FEH 2023-5-10

@Simon Chan Its working!!! Thank you so much!

But do you have any idea how can I make the Xlabel following the new frame no enter in the edit field?

E.g. first set of EditField, the frame no editfield is 0 to 17. Next frame is 17 to 72.

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采纳的回答

Cris LaPierre 2023-5-10

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https://ww2.mathworks.cn/matlabcentral/answers/1960589-update-bar-chart-uiaxes-from-editfield-value-without-deleting-older-plot#answer_1232384

编辑：Cris LaPierre 2023-5-10

在 MATLAB Online 中打开

The way I would approach this in App Designer is to indeed recreate the entire plot each time. I would create an app property to capture the edit field values. Everytime a new value gets added to the edit field, it gets appended to this array.

Then when you plot the data in the bar graph, plot all the values, not just the new ones. The important thing is that your X values indicate the group(s) correctly. The first time, your X value is 1, the second time it is [1 2], etc. You can update the xticklabels to be what you want, but you haven't shared how you determine what they are, so for now, I use group number.

    properties (Access = private)
        Y
    end
    % Callbacks that handle component events
    methods (Access = private)
        % Button pushed function: PlotButton
        function PlotButtonPushed(app, event)
            app.Y = [app.Y; app.TotalAllowableWeighttonEditField.Value, app.ActualTotalWeighttonEditField.Value];
            bar(app.UIAxes,1:size(app.Y,1), app.Y,'grouped','FaceColor','flat');
            legend(app.UIAxes,"Allowance","Actual")
        end
    end

You can add bar height labels by following this example: https://www.mathworks.com/help/matlab/ref/bar.html#mw_735ee38d-9d9f-40cd-b02a-8266af7184d9

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FEH 2023-5-15

Dear @Cris LaPierre, sorry to ask again.

I have write a code as you said.

app.Y = [app.Y; app.TotalAllowableWeighttonEditField.Value, app.ActualTotalWeighttonEditField.Value];

app.X = [app.X; app.FrameEditField.Value];

bar(app.UIAxes, app.Y,'grouped','FaceColor','flat');

legend(app.UIAxes,"Allowance","Actual")

xticklabels(app.UIAxes,app.X)

However, when I try to plot the bar more than 3 times, the error "Dimensions of arrays being concatenated are not consistent" appear at line app.X = [app.X; app.FrameEditField.Value];.